Obama is working to nail down a wide-ranging global agreement to reduce greenhouse gas emissions, accomplished with unprecedented executive fiat.

Obama is working hard to nail down what he hopes will be one of his "signature achievements": a wide-ranging global agreement to reduce greenhouse gas emissions. If all things go according to plan, the agreement will be signed in December. And as with most of the president's triumphs since 2010, this one will be nonbinding and unenforceable, accomplished with unprecedented executive fiat, writes David Harsanyi. If he keeps this up, Obama's single most notable achievement will be circumventing checks and balances with more regularity than any president in history.

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